1. Internal Medicine Unit, Sant'Antonio Abate Hospital, Azienda Sanitaria Universitaria Friuli Centrale , Tolmezzo , Italy
2. Department of Clinical and Experimental Medicine, Infectious Diseases Unit, Azienda Ospedaliera Universitaria Pisana, University of Pisa, Pisa , Italy
3. Institute of Clinical Pathology, Sant'Antonio Abate Hospital, Azienda Sanitaria Universitaria Friuli Centrale, Tolmezzo , Italy
4. Institute of Pathology, University Hospital of Udine, Udine , Italy
5. Infectious Diseases Unit, Trieste University Hospital (ASUGI), Trieste , Italy
6. Clinical Department of Medical, Surgical and Health Sciences, Trieste University, Trieste , Italy